Like Elsa from Frozen just cast a spell.

In scientific language, Polar Vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. Although it always exists near the poles, Vortex weakens in summer and strengthens in winter. But in plain English, it's eyelid freezing, skin melting, -40° cold that came like an uninvited guest in the Midwestern United States.

Here's how Americans rejoiced this mind-numbing cold!

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